Year	Percent
1950	10.18613
1955	10.49769
1960	10.21165
1965	9.33364
1970	10.30954
1975	10.67694
1980	10.95513
1985	10.39605
1990	9.78167
1995	10.54609
2000	11.90207
2005	11.5915
2010	11.06612
2015	10.68011
2020	10.13269
2025	9.82948
2030	9.36766
2035	9.02618
2040	8.63131
2045	8.24928
2050	7.91214
2055	7.61733
2060	7.37641
2065	7.13902
2070	6.9416
2075	6.75744
2080	6.60945
2085	6.48498
2090	6.37794
2095	6.27747
2100	6.18477